Put some wood glue on the joint, and push them together again. Adding another seam will not help.
If you do add the joint, you can cover it with an oak transition piece. T-molding will not be able to get under the floor to do it properly. A typical piece of T-molding is two parts, the lower part that is attached to the floor, and a cover piece. Generally, they are MDF (junk), not real wood.
I have a lot of laminate floors in my rentals. They develop gaps once in a while. That's just the way it is.
FIRE no later than 7/5/2016
at 56 (done), securing '16 401K match (done), getting '15 401K match (done), LTI Bonus (done), Perf bonus (done), maxing out 401K (done), picking up 1,000 hours to get another year of pension (done), July 1st benefits (vacation day, healthcare) (done), July 4th holiday. 0 days left. (done) OFFICIALLY RETIRED 7/5/2016!!